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The '''Slutsky equation''' (or '''Slutsky identity''') in [[economics]], named after [[Eugen Slutsky]] (1880–1948), relates changes in [[Marshallian demand|Marshallian (uncompensated) demand]] to changes in [[Hicksian demand| Hicksian (compensated) demand]], which is known as such since it compensates to maintain a fixed level of utility.  The equation demonstrates that the change in the demand for a good, caused by a price change, is the result of two effects:
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* a [[substitution effect]], the result of a change in the [[relative price]]s of two goods; and
* an [[income effect]], the effect of a change in price resulting in a change in the consumer's purchasing power.
 
The Slutsky equation decomposes the change in demand for good ''i'' in response to a change in the price of good ''j'':
 
:<math>{\partial x_i(\mathbf{p}, w) \over \partial p_j} = {\partial h_i(\mathbf{p}, u) \over \partial p_j} - {\partial x_i(\mathbf{p}, w) \over \partial w } x_j(\mathbf{p}, w),\,</math>
 
where <math>h(\mathbf{p}, u)</math> is the Hicksian demand and <math>x(\mathbf{p}, w)</math> is the Marshallian demand, at the vector of price levels <math>\mathbf{p}</math>, wealth level (or, alternatively, income level) <math>w</math>, and fixed utility level <math>u</math> given by maximizing utility at the original price and income, formally given by the [[indirect utility function]] <math>v(\mathbf{p}, w)</math>.  The right-hand side of the equation is equal to the change in demand for good ''i'' holding utility fixed at ''u'' minus the quantity of good ''j'' demanded, multiplied by the change in demand for good ''i'' when wealth changes.
 
The first term on the right-hand side represents the substitution effect, and the second term represents the income effect.<ref>Nicholson, W. 2005. ''Microeconomic Theory''. 10th edn. Mason, Ohio. Thomson Higher Education.</ref> Note that since utility is not observable, the substitution effect is not directly observable, but it can be calculated by reference to the other two terms in the Slutsky equation, which are observable. This process is sometimes known as the Hicks decomposition of a demand change.<ref>Varian, H. 1992. ''Microeconomic Analysis''. 3d edn. New York, N.Y. W.W Norton & Company, Inc</ref>
 
The same equation can be rewritten in matrix form to allow multiple price changes at once:
 
:<math>\mathbf{D_p x}(\mathbf{p}, w) = \mathbf{D_p h}(\mathbf{p}, u)- \mathbf{D_w x}(\mathbf{p}, w) \mathbf{x}(\mathbf{p}, w)^\top,\,</math>
 
where '''D<sub>p</sub>''' is the derivative operator with respect to price and '''D<sub>w</sub>''' is the derivative operator with respect to wealth.
 
The matrix <math>\mathbf{D_p h}(\mathbf{p}, u)</math> is known as the '''Slutsky matrix''', and given sufficient smoothness conditions on the utility function, it is symmetric, negative semidefinite, and the [[Hessian matrix|Hessian]] of the expenditure function.
 
==Derivation==
While there are several ways to derive the Slutsky equation, the following method is likely the simplest. Begin by noting the identity <math>h_i(\mathbf{p},u) = x_i (\mathbf{p}, e(\mathbf{p},u))</math> where <math> e(\mathbf{p},u)</math> is the [[expenditure function]], and ''u'' is the utility obtained by maximizing utility given '''p''' and ''w''.  Totally differentiating with respect to ''p<sub>j</sub>'' yields the following:
 
:<math> \frac{\partial h_i(\mathbf{p},u)}{\partial p_j} = \frac{\partial x_i(\mathbf{p},e(\mathbf{p},u))}{\partial p_j}  + \frac{\partial x_i (\mathbf{p},e(\mathbf{p},u))}{\partial e(\mathbf{p},u)} \cdot \frac{\partial e(\mathbf{p},u)}{\partial p_j}</math>.
 
Making use of the fact that <math> \frac{\partial e(\mathbf{p},u)}{\partial p_j} = h_j(\mathbf{p},u)</math> by [[Shephard's lemma]] and that at optimum,
:<math> h_j(\mathbf{p},u) = h_j(\mathbf{p}, v(\mathbf{p},w)) = x_j(\mathbf{p},w), </math> where <math>v(\mathbf{p},w)</math> is the [[indirect utility function]],
 
one can substitute and rewrite the derivation above as the Slutsky equation.
 
==See also==
* [[Consumer choice]]
* [[Hotelling's lemma]]
 
==References==
{{reflist}}
[[Category:Consumer theory]]
[[Category:Equations]]

Latest revision as of 19:36, 29 April 2014

- The herb gingko will boost circulation levels in 6 to 8 weeks. Drugs containing Nitroglycerine, isosorbide mononitrate, isosorbide dinitrate are recommended as bothersome for making use of with tadalafil. This doesn't necessarily mean eating up your greens like your mother told you. To learn more about the on your body and how our product can help you, please visit our site to claim your free report: The Algae, Adult Stem Cell and Omega 3 Connection. This erection obtained can be maintained for the amount of time desired by the user.

So in case you are asking yourself if you're able to still be in good shape after 40 the answer is yes, nevertheless you must understand that if you wish to stay in this shape you'll need exercise. Unfortunately, millions of men can make this fatal error. Males with erectile problems are the majority of the time attempting to reach orgasm inside a hurry because they're afraid of losing an erection before intercourse is done, deeply disturbed, these men ejaculate faster than hoped. He has snubbed the world's most powerful spy agency and government with abandon. Have you unwittingly let yourself take part in the great internet pornography experiment.

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If you are not completely satisfied with the results, you don't pay a cent. Unfortunately, few of them deliver the promised benefits. These dangerous workouts are also the causes of impotence. The judicial system has a vested interest in protecting the institution that is marriage so it is only to be expected that certain legal barriers are erected to prevent marriages from being annulled on a whim. A number of different conditions may cause impotence, including: -.

It can ruin relationships between people, making it extremely difficult for them to manage sexual relationships. Ingesting medium chain fatty acids is rather valuable for people, as they're quickly burnt by the human body filling it with the needed degree of stamina. However, without proper knowledge, they can also be used improperly. An ability to maintain a penile erection requires a healthy & sound nervous system, healthy arteries in and near corpora cavernosa, smooth muscles & fibrous tissues in corpora cavernosa and abundant levels of nitric oxide. This medication can benefit a number of mood disorders.

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